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[SCSI] libsas: add sas_abort_task 

This patch adds an external function, sas_abort_task, to enable LLDDs
to abort sas_tasks.  It also adds a work_struct so that the actual
work of aborting a task can be shifted from tasklet context (in the
LLDD) onto the scsi_host's workqueue.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Darrick J. Wong 2006-10-30 15:18:50 -08:00 committed by James Bottomley
parent f456393e19
commit 79a5eb609b
2 changed files with 64 additions and 0 deletions
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60
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -33,6 +33,7 @@
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "../scsi_sas_internal.h"
#include "../scsi_transport_api.h"
#include <linux/err.h>
#include <linux/blkdev.h>
@ -798,6 +799,64 @@ void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
spin_unlock_irqrestore(&core->task_queue_lock, flags);
}
static int do_sas_task_abort(struct sas_task *task)
{
struct scsi_cmnd *sc = task->uldd_task;
struct sas_internal *si =
to_sas_internal(task->dev->port->ha->core.shost->transportt);
unsigned long flags;
int res;
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("%s: Task %p already aborted.\n", __FUNCTION__,
task);
return 0;
}
task->task_state_flags |= SAS_TASK_INITIATOR_ABORTED;
if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
if (!si->dft->lldd_abort_task)
return -ENODEV;
res = si->dft->lldd_abort_task(task);
if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
(res == TMF_RESP_FUNC_COMPLETE))
{
/* SMP commands don't have scsi_cmds(?) */
if (!sc) {
task->task_done(task);
return 0;
}
scsi_req_abort_cmd(sc);
scsi_schedule_eh(sc->device->host);
return 0;
}
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags &= ~SAS_TASK_INITIATOR_ABORTED;
if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
return -EAGAIN;
}
void sas_task_abort(struct sas_task *task)
{
int i;
for (i = 0; i < 5; i++)
if (!do_sas_task_abort(task))
return;
SAS_DPRINTK("%s: Could not kill task!\n", __FUNCTION__);
}
EXPORT_SYMBOL_GPL(sas_queuecommand);
EXPORT_SYMBOL_GPL(sas_target_alloc);
EXPORT_SYMBOL_GPL(sas_slave_configure);
@ -805,3 +864,4 @@ EXPORT_SYMBOL_GPL(sas_slave_destroy);
EXPORT_SYMBOL_GPL(sas_change_queue_depth);
EXPORT_SYMBOL_GPL(sas_change_queue_type);
EXPORT_SYMBOL_GPL(sas_bios_param);
EXPORT_SYMBOL_GPL(sas_task_abort);

4
include/scsi/libsas.h
View File

@ -528,6 +528,8 @@ struct sas_task {
void *lldd_task; /* for use by LLDDs */
void *uldd_task;
struct work_struct abort_work;
};
@ -627,4 +629,6 @@ void sas_unregister_dev(struct domain_device *);
void sas_init_dev(struct domain_device *);
void sas_task_abort(struct sas_task *task);
#endif /* _SASLIB_H_ */